what is speedometer ? and how it is help ?
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Devices that indicate the speeds at which vehicles travel are called speedometers. Usually they are variations of tachometers, instruments that measure the revolutions per minute of a rotating shaft (see Tachometer). ... The vehicle's speed is indicated by a pointer on a clocklike dial.
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speedometer, instrument that indicate the speed of a vehicle usually combined with the device. known as a odometer that records the distance traveled.
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